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Joaquin Coromina f4718f2a36 docs: dev-documentation for adding new backend/mcp tools (#7011)
## 📝 Summary

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#123).
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This adds dev documentation for adding new mcp and backend tools
following the implementation of `add-lint-rules.md`. It also shares best
practices, common pitfalls (that I faced), and visual examples.

## 🔍 Description of Changes

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## 📋 Checklist

- [x] I have read the [contributor
guidelines](https://github.com/marimo-team/marimo/blob/main/CONTRIBUTING.md).
- [ ] For large changes, or changes that affect the public API: this
change was discussed or approved through an issue, on
[Discord](https://marimo.io/discord?ref=pr), or the community
[discussions](https://github.com/marimo-team/marimo/discussions) (Please
provide a link if applicable).
- [ ] I have added tests for the changes made.
- [ ] I have run the code and verified that it works as expected.
2025-10-30 16:26:55 -04:00
..
2024-11-27 15:58:51 -05:00